Grey-scale rendering

The following is outdated as the GREY color is now part of the core library. Please refer to gb.display.setColor.

The following code shows how to display 3 colors on the Gamebuino LCD: black, white and grey. It achieves this by alternating the color of the grey pixels across subsequent frames. The demo also scrolls the background to show that real-time flicker-free full-screen rendering is indeed possible.